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You can catch exceptions using the try ... with ... language construct and : type-test patterns, which filter any exception value caught by the with clause. For example: > try raise (System.InvalidOperationException ("it's just not my day")) with | : System.InvalidOperationException -> printfn "caught!";; caught! 5 covers these patterns more closely. The following code sample shows how to use try ... with ... to catch two kinds of exceptions that may arise from the operations that make up the http method, in both cases returning the empty string "" as the incomplete result. Note that try ... with ... is just an expression, and it may return a result in both branches: open System.IO let http(url: string) = try let req = System.Net.WebRequest.Create(url) let resp = req.GetResponse() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html with | : System.UriFormatException -> "" | : System.Net.WebException -> "" When an exception is thrown, a value is created that records information about the exception. This value is matched against the earlier type-test patterns. It may also be bound directly and manipulated in the with clause of the try ... with constructs. For example, all exception values support the Message property: > try raise (new System.InvalidOperationException ("invalid operation")) with | err -> printfn "oops, msg = '%s'" err.Message;; oops, msg = 'invalid operation'

Exceptions may also be processed using the try ... finally ... construct. This guarantees to run the finally clause both when an exception is thrown and when the expression evaluates normally. This allows you to ensure that resources are disposed after the completion of an operation. For example, you can ensure that the web response from the previous example is closed as follows:

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In this command, we specify our desired keywords, and then create a specification based upon the path /usr/bin. When run, mtree writes the specification to stdout. We capture this and redirect it to the file at path /Volumes/mtree_spec_files/myFreshSpec.txt. Preferably, once the file is written, it is then placed into a read-only state, safe from alteration or subterfuge. Once this specification file is in a secure place, preferably a read-only network mount, we can then reference it to audit the active environment. To do this, we call mtree with the following syntax:

NOTE: Although multitouch capability was included in the very first commercial Android release, Google didn t turn on the capability by default until Android 2.1. The result may have been one of the reasons Apple launched a patent infringement lawsuit against HTC in 2010. The suit is seen by many analysts as a proxy lawsuit against Google.

let httpViaTryFinally(url: string) = let req = System.Net.WebRequest.Create(url) let resp = req.GetResponse() try let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html finally resp.Close() In practice, you can use a shorter form to close and dispose of resources, simply by using a use binding instead of a let binding. This closes the response at the end of the scope of the resp variable, a technique that is discussed in full in 8. Here is how the previous function looks using this form: let httpViaUseBinding(url: string) = let req = System.Net.WebRequest.Create(url) use resp = req.GetResponse() let stream = resp.GetResponseStream() let reader = new StreamReader(stream) let html = reader.ReadToEnd() html

/usr/sbin/mtree -f /Volumes/mtree_spec_files/myFreshSpec.txt -k gid gname sha1digest mode uid uname link type time -p /usr/bin modification time expected Mon Jan 25 00:29:27 2010 found Mon Jan 25 01:16:14 tar changed modification time expected Mon Jan 25 00:29:27 2010 found Mon Jan 25 01:16:14 link_ref expected bsdtar found /tmp/XEOSUHEJOUE/t4Rpwn4g3

F# lets you define new kinds of exception objects that carry data in a conveniently accessible form. For example, here is a declaration of a new class of exceptions and a function that wraps http with a filter that catches particular cases: exception BlockedURL of string let http2 url = if url = "http://www.kaos.org" then raise(BlockedURL(url)) else http url You can extract the information from F# exception values, again using pattern matching: > try raise(BlockedURL("http://www.kaos.org")) with | BlockedURL(url) -> printf "blocked! url = '%s'\n" url;; blocked! url = 'http://www.kaos.org' Exception values are always subtypes of the F# type exn, an abbreviation for the .NET type System.Exception. The declaration exception BlockedURL of string is shorthand for defining a new F# class type BlockedURLException, which is a subtype of System.Exception. Exception types can also be defined explicitly by defining new object types. s 5 and 6 look more closely at object types and subtyping. Table 4-3 summarizes the exception-related language and library constructs.

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